Why are using drugs and alcohol automatically destructive behaviours? I imagine you know and work with many people who use drugs and/or alcohol and also have fa

Why are using drugs and alcohol automatically destructive behaviours? I imagine you know and work with many people who use drugs and/or alcohol and also have families, friends, hobbies, career trajectories and are overall reasonably happy, well-adjusted people. I mean, that describes virtually everyone I know! The problem cases certainly exist, but within my personal world, those people are the exceptions.